Brake Disc Wear

[SmallTorque]

Hope somebody can shed light on following. While cleaning the wheels noticed the surface of rear offside disc on my 200 Sport looks very ridged. The rear nearside disc shows slight wear, but both front discs are smooth. Car is 04 reg, has only done just over 4000 miles and was serviced by Lexus dealer couple of months ago. Cannot visit dealer easily for opinion as located on island so hoping one of the many knowledgeable folks on the forum can give me benefit of his /her advice. Thanks!

[Steve ( West Mids )]

Try running your finger nail across the surface when the discs are cool and see if you can feel ridges on one. If so then it doesn't sound right. Could be stone / grit caught under the pads. My IS200 had done 35k when I sold it in April and no problems with the discs at all.

[SmallTorque]

Thanks your reply, Steve. Yes, have felt the disc and there are definite ridges. Should it have prompt attention? Car appears to be handling OK and as mentioned not easy to get to the dealer.